(CNN) – Satellite images appear to show new activity at North Korea’s main nuclear site analysts say it’s primed and prepped for the country’s sixth nuclear test. The tension rising while concerns are growing over whether the regime could pose a chemical weapons threat.

Japanese Prime Minister Shinzo Abe calling the security situation increasingly severe as us warships reach the waters off the Korean peninsula a warning message from Washington.

Abe said, “Many people believe North Korea leadership, irrational willing to do anything for its survival”

The goal for North Korean dictator Kim Jong Un an intercontinental ballistic missile capable of delivering a nuclear tipped warhead to the continental U.S.

Tong Zhao, said, “it’s not economical to use ICBM to deliver chemical weapons, makes sense for nuclear warhead, chemical weapons more relevant for regional targets like Seoul or Japan.”

Two years ago U.S. Defense officials concluded North Korea was capable of it when they said, “North Korea probably has a had a long standing chemical weapons program with the capability to produce nerve, blister, blood and choking agents they probably could employ chemical weapons agents by modifying a variety of conventional munitions, including artillery and ballistic missiles.”

In 2011 former U.S. Secretary of State John Kerry testified and said, “They have one of largest stockpiles in the world.”

Kim Jong Un is already accused of deploying a chemical weapon of mass destruction. U.S. and South Korean officials say VX agent were used to kill his half-brother Kim Jong Nam and that he dictator ordered the hit. North Korea denies any involvement.